Ok I thought about it and with Orca in front line the only viable monsters that you can use as stun protection that come to mind are F.D. Iris, Bloomluga, Awakened XYZ and Willowyrm.
Freezecobra <- Toxic Killer
Gearcroc or any protectors <- True Hit
Arboribratus <- True Hit + Toxic Killer
Stun Counters/Converters <- Chrono Killer
Bitterbeast, Utopion <- Chrono Killer (although Bitter can deal with it better than most)
Sorry but this is absolute nonsense. He needs Camoflage Entrance or a new secret skill + removal of RAW.